MAHLE 0831302 Engine Piston with Rings and Pin - BMW M54 B30 84.5mm Bore +0.50mm Oversize

The MAHLE 0831302 is an OE-quality engine piston with rings and pin designed for the BMW M54 B30 (306S3) 3.0L inline-six engine. This is a +0.50mm oversize piston with an 84.5mm bore diameter and 48.3mm compression height, featuring a skirt coating for reduced friction and improved break-in performance. Sold as a single unit.

Key Features:

• OE-Quality Construction – Engineered to meet or exceed original equipment standards for fit, form, and function
• Compensated Ring Grooves – Ensure proper ring loading and effective oil control throughout the piston's service life
• Expansion-Controlled Design – Allows tight fitting clearances to reduce engine noise, minimize wear, lower emissions, and improve oil control
• Coated Skirt – Reduces friction between the piston and cylinder wall for smoother operation and extended service life
• Complete Kit – Includes piston, ring set, and wrist pin for a straightforward engine rebuild
• +0.50mm Oversize – Designed for use in engines that have been bored 0.50mm over standard to restore proper cylinder-to-piston clearances

MAHLE is one of the world's largest original equipment piston manufacturers, supplying major automotive OEMs globally. Founded in 1920 in Stuttgart, Germany, MAHLE has decades of precision engineering expertise across pistons, rings, and complete engine components. This piston is part of MAHLE's OE replacement line, delivering the same quality and dimensional accuracy as the factory-installed part.